Countersink-gage



H. D. SPAHLING. CO'UNTEBSINK GAGE. APPLICATION FILED JULY 25, 1919.

1,3 9,390, v I Patented Aug. 30,1921.-

UNITED STATES PATENT OFFICE.

HARRYD..SPARLI1 TG, OF \VALDEN, NEW YORK.

COUNTERSINK- GAGE.

Application filed July 25,

To all whom it may concern:

Be it known that HARRY D. SPARLING, a citizen of the United States, residing at l l alden, in the county of Orange and State of New York, has invented new and useful Improvements in Countersink- Gages, of which the following is a specification.

The object of the invention is to provide means for use in conjunction with countersinks to prescribe the depth to which the countersink may enter a hole. The device thus provides for the counter-sinking of all holes a specified depth so that rivets or screws that may be inserted through the holes may leave their heads flush with the surface of the plate or the stock through which they may pass. The device is particularly serviceable in ship work in which at the present time the countersinking is done without any means for gaging the depth to which the countersink enters. Thus some holes are countersunk deeply while others are left shallow and in order that riveted work may be flush with the surface of the plate, it is sometimes necessary to chip oft the rivet where it projects beyond the surface due to the hole not being countersunk a sullicient depth.

A further object of the invention is to provide means for the adjustment of the gag ing, so that the depth to which the countersink may work may be varied.

Other and further objects appear in the tlollowing description wherein the invention is set forth in detail.

To the exact construction in which the invention is shown and described, it is not to be restricted. The right is reserved to make such changes or alterations as the actual reduction to practice may suggest, in so far as such changes or alterations are compatible in spirit with the annexed claim.

In the acompanying drawings:

Figure 1 is a view in side elevationof a countersink equipped with the improved device.

Fig. 2 is a view similar to Fig. l but showing the gage in section.

Fig. 8 is a plan'view of a clip used to retain the gage in position.

As shown, the invention is applied in con. junction with the usual form of countersink 1 provided with the usual shank 2 for bold Specification of Letters Patent.

Patented Aug. 30, 1921.

1919. Serial No. 313,334.

ing the same in appropriate rotating means. To provide for the attachment of the improved gage, a peripheral slot 3 is formed in the body of the countersink. The gage comprises a cylindrical member 4 formed with a frusto conical end 5 and this gage is dimensioned to slide over the body of the countersink and to allow the nose of the countersink to project through the smaller base of the frusto conical end 5. The gage may be moved longitudinally with respect to the body of the countersink to provide for various degrees of expansion of the nose through the opening end of thegage and to this end there are provided a plurality of perforations 6 formed in the cylindrical portion t on diametrically opposite sides, each hole 6 being opposite a corresponding hole on the opposite side of the cylindrical portion. A spring clip 7 embraces the cylindrical portion and is formed with two inturned teats or lugs 8 which pass through any pair of holes 6 to have their ends engage in the slot 3. The clip is attached or detached by springing these opposite ends apart to disengage the teats from the holes 6 and these teats may then be engaged in another pair of holes, the degree to which the nose of the countersink projects through the open end of the gage being determined by the holes 6 which the teats 8 engage. Thus the device can be set so that the lower end of the gage will abut the work when the nose has penetrated the work a specified distance and.

at this point further penetration of the countersink is precluded.

The invention having been described, what is claimed as new and useful is:

The combination with a countersink, having a peripheral slot formed therearound, of a gage member in surrounding relation to the countersink, the gage member being formed with a plurality of holes on diametrically opposite sides formed at varying distances from the working edge, the oppositely disposed holes being arranged in pairs, and a clip member embracing the gage and having teats or lugs formed on its ends, which teats or lugs enter the holes and engage in said slot for the purpose specified.

In testimony whereof he afiixes his signature.

HARRY D. SPARLING. 

